nbc news justice correspondent pete williams is on the case with the latest in the investigation. pete, what are we learning now? what are the ratest, first of all, from dzhokhar tsarnaev, and do they believe he and his brother were lone wolfs? >> you may recall that the charges against him were actually filed under seal on sunday, he had his initial appearance in the hospital on monday, and as far as we know, they haven't attempted to re-interview him since then. he's getting with his lawyers, trying to figure out how to proceed. in essence his's confessed already. he's told authorities that he and his brother did it, he's given a reason why, their opposition to the wars in iraq and afghanistan, which think thought were attacks on islam. and he said they were not inspired by foreign countries or foreign interests that they came up with this plot on their own, and that's largely what he said. there are other little details. so i think it will be a while yet before they're able to talk to him any more. >> we're hearing there was some confusion yesterday, because after a briefing fo